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Sustainable urban drainage

1. Reducing your surface water drainage charges. The best way to reduce surface water drainage charges is to prevent surface water entering the public sewer. This presentation explains ways to do that (often described as sustainable urban drainage) and covers:An outline of sustainable urban drainage and its benefitsPermeable surfaces and filter drainsInfiltration devicesBasins and ponds.

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Sustainable urban drainage

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    1. Sustainable urban drainage

    2. 1 Reducing your surface water drainage charges The best way to reduce surface water drainage charges is to prevent surface water entering the public sewer. This presentation explains ways to do that (often described as sustainable urban drainage) and covers: An outline of sustainable urban drainage and its benefits Permeable surfaces and filter drains Infiltration devices Basins and ponds

    3. 2 What is sustainable drainage? Sustainable urban drainage systems (SUDS) provide a natural approach to managing drainage in and around sites. SUDS work by slowing and holding back the run-off from a site, allowing natural processes to break down pollutants. SUDS deal with run-off close to the source, rather than transporting it elsewhere via the public sewer system.

    4. 3 Benefits of sustainable drainage systems Slow down surface water run-off from your site to help reduce the chances of flooding Reduce the risk of sewer flooding during heavy rain Recharge groundwater to help prevent drought Provide valuable habitats for wildlife in built up areas Can create green spaces for people in urban areas Can help reduce your surface water drainage charges

    5. 4 Permeable surfaces and filter drains Filter drains and permeable surfaces are devices that have a volume of permeable material below ground to store surface water. Run off flows to this storage area via a permeable surface. Examples of this are: Grass Reinforced grass Gravelled areas Solid paving blocks with large vertical holes filled with soil or gravel Solid paving blocks with gaps between the individual units Porous paving blocks with a system of voids within the unit Continuous surfaces with an inbuilt system of cavities

    6. 5 Car park drainage does not have to go to sewer Infiltration is where surface water is directed via cavities within areas of solid paving With a porous surface water is drained directly through the surface

    7. 6 Infiltration devices Infiltration devices drain water directly into the ground. They may be used at source or the run off can be conveyed in a pipe or swale to the infiltration area. They include soakaways, infiltration trenches and infiltration basins as well as swales, filter drains and ponds. Infiltration devices can be integrated into and form part of landscaped areas. Soakaways and infiltration trenches are completely below ground, so water should not appear on the surface. Infiltration basins and swales for infiltration store water on the ground surface, but are dry except in periods of heavy rainfall.

    8. 7 Infiltration devices (continued)

    9. 8 Basins and ponds – how they work Basins are areas for storage of surface runoff that are free from water during dry weather conditions. These structures include: Flood plains Detention basins Extended detention basins Ponds contain water in dry weather and are designed to hold more when it rains. They include: Balancing and attenuation ponds Flood storage reservoirs Lagoons Retention ponds Wetlands

    10. 9 Basins and ponds

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